Вправа 271 алгебра Бевз гдз 7 клас

№ 271

1. a) (7x³ – 2x) + (5 + 11x – 6x³) = х² + 9х + 5;
   б) (8ab + 7b – (4ab + 7b – 3) = 8ab + 7b – 4ab – 7b + 3 = 4ab + 3;
   в) (1 – n + n²) – (3n² – 2n + 5) – 7n = 1 – n + n² – 3n² + 2n – 5 –
   – 7n = –2n² – 6n – 4;
   г) (х²у + xy²) – (3x²y – 2xy² – 7) + 2x²y =x²y + xy² – 3x²y + 2xy² +
   + 7 + 2x²y = 3xy² + 7;
   ґ) 8ac – (3а² – 2c² + 2ac) – (4a² + 2c²) = 8ac – 3a² + 2c² – 2ac –
   – 4a² – 2c² = –7a² + 6ac.